Paper Instruments releases Ultramarine 1 Flash, post-trained from GLM-5.3 Flash for $300K; claims it beats Claude Fable 5 on some knowledge-work benchmarks (reports)

Verified (fact)

Paper Instruments, a five-person research team, released Ultramarine 1 Flash, a model specialized for professional knowledge work, on the 14th (local time). The team built it by further training the open-source model GLM-5.3 Flash for about $300,000 (about 400 million won). The API is already available, and the model weights will be released in two weeks.

Needs fact-check (claim)

The team claims the model scored higher than Claude Fable 5 on some knowledge-work benchmarks. It also claims that, in its own evaluation, cost per task is about 1/63 of Fable 5's. All results come from the team's own evaluations.

Why it matters (interpretation)

This shows that a small team with a modest budget can post-train an open model to compete with frontier models in a specific domain. Once the weights are released, the results can be checked independently.

Sources

• Press 30만달러 사후 학습으로 ‘페이블 5’ 넘었다…‘울트라마린 1 플래시’ 공개 AI Times (Korea)